Bobbin trimming and cleaning machine



. 1,695,681` s. L. CASELLA y BoIN Txzfrmm'wf'mm LEAmNG 4ummm-z Tired Aug; e', 1927 ATTORNEYS Patented Dec. V18,` 1928.

UNITED ASTATES PATENT OFFICEg-o SECONDO L. CASELLA, OFNnw YORK, N. Y., AssIGNOR To YALE ELECTRIC CORPORA- ,j

TION, on BROOKLYN, New YORK, A CORrORA'rION or New YORK. l

y BOBBIN TRIMMING AND CLEANING ivrACHiNn.r

" Applicationled August 6, 1927. Serial No. 211,108'.

. Bobbins of the-above type are yextremeizly fragile and mustbe handled with particular care when .used naked, that is without a wrapper vor other cover for the depolarizing mixture, otherwise careless handling of the bobbins during the manufacture of battery cells is likely to cause Aparticles of depolarizing mixture particularly at the sharp corner or edge of the bobbin to be broken away, with the resultk that such particles cause internal short-circuiting of the cells, thus rendering them useless after arelatively short period of time. l

An object of the present invention is to provide a simple andeflicient machine for trimming from bobbins of the above type the sharp corner or edge of the depolarizing mixture, thus rendering suchbobbins less likely to disintegrate during assembling of the bat-v tery cell. l

A further object of the invention is to provide in a machine of the character mentioned, means for removing from the surface of the `bobbin such loose and finely divided particles of depolarizing material as may be thereon before and after the trimming operation.

Other objects and advantages of the invention will become apparent from the following description, taken in connection with the accompanying drawingsin which-` o Figure 1 is a plan view of the machine. Figure 2 is a front view of the machine as viewed from the right in Figure 1. Figure 3 is a vertical sectional view taken'on the line 3-3 of Figure 1, Figure 4 is a detail view showing means by which the cutting tool for trimming the bobbin is mounted, and Figure 5 is a erspective view of a bobbin from which the re atively sharp corner or edgehas been removed by the machine shown in Figures 1 to 4 inclusive. v

Referring to the drawing the numeral 10 indicates a base or support upon which is suitably mounted an electric motor 11, to the shaft of which isconnected a sleeve 12, provided with a vertically disposed disc 13. Thedisc 13 is provided with a'support 14 mixture is having-an inclined face 15, which is undercut as shown at 16 toreceive the beveled margin of a cutter 17.- This cutter17 is removably held in position upon thesupport 14 by a,V

clamp plate 19 having one edge undercut, as shown at 20, to receive the beveled margin of the cutter 17. The holding platel9`is suitably connected to the support 14 by a pair of j lag screws 22 which may be partially removed to permit the 'cutter `17 to be removed for sharpening or to permit such` cutter to be adjusted horizontally, as viewed in Figure,

whereby @the amount oef-material to be removedfrom the corner'or, edge of the bobbin;

may `be varied.

Vhenpresenting thebobbin to the cutter l7,-such bobbinis projected through an annular tube 24 until the bottom of the carbon electrode engages a stop lug 25carried by the disc 13 centrally thereof. This annular tube 24 serves as an air,y duct adapted to communicate, through a conduit 18, with a suitable source of air pressure, not shown, and is provided with a series of perforations 26, which are sol disposedas to project a plurality of streams of air, towards the disc 13 and'towards the axis about Awhich such disc rotates -at such an angle that the streams of air impinge Y upon the peripheral surface of thebobbin and remove therefrom, both beforeand after the trimming operation, suchk loose or segrej y Y Vgated particles of depolarizing mixturev as may adhere thereto. Y

In frontof the annular duct 24, which is ysupported coaxially with the disc 13 byV a suitable bracket 27 carried by the base 10, n

is arranged a supporting block r28 upon which is positioned a bobbin guide or rest 29. This bobbin guide is formed with a ypair of inwardly` and downwardly converging faces 30 which are so spaced from each other and from the axis of the disc 13 that when the bobbin is at rest thereon such bobbin may be'maintained in alignment with the axis of the disc ,13 with the lower end of the carbon electrode 31 rest-ing against the stop lug 25, `thereby insuring uniform` trimming of the bobbin to produce at the lower end of each a. beveled face 32 as shown in Figure 5. v i

Between the bobbin guide 29 and Vthe cutter 17 is arranged a guard plate 33 which is suitably connected to the supporting block it is presented to the cutter 17. This guard plate 33 serves to insure the operators hand aainst injury by the rota-tinagr cutter 17 and a so serves to prevent such particles of depolarizing material as are removed by the cutter 17 from being unduly disturbed by the force of the streams of air issuing from the perforations 26 formed in the annular tube 24.

Vhat is claimed is:

1. A battery bobbin trimming machine includingr a rotary cutter adapted to engage a corner of a bobbin and remove a portion of the depolarizing material from the bobbin in that vicinity, a support for supporting the bobbin as it is presented to said cutter, and fluid pressure means for removing loose particles of depolarizing material from the surface of the bobbin, said fluid pressure means including an annular perforated tube through Which the bobbins are passed as they are 'presented to said cutter and through which the bobbins are Withdrawn as they are re- `tracted from said cutter.

2. A battery bobbin trimming machine including a rotary disc, a cutter carried by said disc and having its cutting edge inclined With respect to the axis of said disc, and a guiding support adapted to support the bobbin as it is presented to said cutter, and an annular perforated tube adapted for connection with a source of air pressure, said tube being so located With respect to said support as to encircle the bobbin as it is presented to and retracted from said cutter and having' its perforations so arranged as to direct their respective jets of air onto the surface of the bobbin as it is presented to and retracted from said cutter.

A battery bobbin trimming machine including ai rotary cutter adapted to engage a corner of a bobbinand remove a portion of the depolarizing material from the bobbin in that vicinity, a Huid pressure means arranged adjacent said cutter and having a plurality of air ports adapted to deliver a plurality of jets of air towards the axis of rotation of said cutter and into contact with the surface of the bobbin as it is retracted from said cutter.

In testimony whereof, I have affixed my signature to this specification.

SECONDO L. CASELLA. 

